This post is based on my experience from past 3 weeks when I already started working in NGO, where I deliver English classes.
People wake up early, grab some bread and coffee, if they have time, and go for bus. Same as I do. People from suburban and living areas need to travel to commercial zones that offer more jobs. Those are in general Downtown, Copacabana or Barra. The mean of transportation is usually a bus. Also people living in the opposite part of the Guanabara bay in Niteroi might take a ferry.